CALL: PLOT_CONTOURS


matrix

  The matrix to be plotted.

  This matrix should be 2-dimensional, and have a length of at
  least 2 in both directions. In the descriptions, the first
  index of the matrix will be written x, the second y.

  The overall size of the matrix is limited to an amount that
  depends on the graphics system used (NAG or HIGZ) but is in
  both cases very large (around 10000 words at least).

n_contours

  Number of contours to be drawn. If the ROUND option is used,
  this number is used as an indication only - the actual number
  will usually be larger.

  The permissible range depends on the underlying graphics
  system, but usually covers [2,50].

options

  A string containing options chosen from the following list.
  Most options are only applicable to one graphics system and
  are neglected on the others.

  ------------------------------------------------------------------
  Option       Effect
  ------------------------------------------------------------------
  POLAR        Polar coordinate system
  CARTESIAN    Cartesian coordinate system
  ROUND        Select nearest round numbers for contour heights
  LABEL        Labels the contours
  COLOUR       Produces a colour map, or colours the contours.
  TYPE         Distinguish the contours by line type
  ------------------------------------------------------------------

x-vector

  Vector with the x-coordinates of the matrix.

  Only the first and last element are used to set the
  scale along the x-axis of the plot.

  If omitted, a range of [0, 1] is assumed.

y-vector

  Vector with the y-coordinates of the matrix.

  Only the first and last element are used to set the
  scale along the x-axis of the plot.

  If omitted, a range of [0, 1] is assumed.

x-label

  A string to be placed along the x-axis.

  If omitted, the name of the global variable associated
  with x-vector is used, if there is one, otherwise the
  string 'x-axis' is taken.

y-label

  A string to be placed along the y-axis.

  If omitted, the name of the global variable associated
  with y-vector is used, if there is one, otherwise the
  string 'y-axis' is taken.

title

  A string to be placed above the plot.

  If omitted, the name of the global variable associated
  with matrix is used, if there is one, otherwise the
  title is left blank.

Keyword index. Formatted on 10/11/98.